You mean Nixsys? Did you go to their “Legacy” section?
https://nixsys.com/legacy-computers/windows-7-computers
The one I’m looking at gives these options to choose from:
No Windows Operating System Installed - + $0.00
MS Windows XP Professional 32-bit SP3 (supports max 4GB RAM) - + $195.00
MS Windows 7 Professional 32-bit (supports max 4GB RAM) - + $185.00
MS Windows 7 Professional 64-bit - + $185.00
Ah-ha, I see that detail specs page now. They DO have 64-bit OS for Win-7 Pro. Thanks.
The one I was looking at was:
https://nixsys.com/legacy-computers/windows-7-computers